Isoscalar-isovector interferences in $\pi N\to N e^+e^-$ reactions as a probe of baryon resonance dynamics

A.I. Titov; B. Kämpfer

doi:doi:10.1007/s100500170030

EPJ

a
b
c
d
e
ap
st
h
plus
ds
pv
ti
qt
am
n

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A 12, 217-229 (2001)

Isoscalar-isovector interferences in $\pi N\to N e^+e^-$ reactions as a probe of baryon resonance dynamics

A.I. Titov^{1, 2} and B. Kämpfer¹

¹ Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany
² Bogolyubov Laboratory of Theoretical Physics, JINR, Dubna 141980, Russia

kaempfer@fz-rossendorf.de

(Received: 14 August 2001 Communicated by V.V. Anisovich)

Abstract
The isoscalar-isovector ( $\rho$ - $\omega$ ) interferences in the exclusive reactions $\pi^-p\to n e^+e^-$ and $\pi^+n \to p e^+e^-$ near the $\omega$ threshold leads to a distinct difference of the dielectron invariant-mass distributions depending on beam energy. The strength of this effect is determined by the coupling of resonances to the nucleon vector-meson channels and other resonance properties. Therefore, a combined analysis of these reactions can be used as a tool for determining the baryon resonance dynamics.

PACS
13.75.-n - Hadron-induced low- and intermediate-energy reactions and scattering (energy less than or equal to 10 GeV).
14.20.-c - Baryons (including antiparticles).
21.45.+v - Few-body systems.

© Società Italiana di Fisica, Springer-Verlag 2001